Manual Iris Lens: Manual Iris Lens is the kinds of lens which can adjust by manual the view angle.
Manual Iris lens have different view angle for long distance with small angle or short distance with
big angle. Manual iris lens have different apeture from 2.8nn, 3.6mm till 60mm etc. Most dome cameras,
board cameras equiped with manual iris lens up to differenet view angle for different project requirement.
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